Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET2010PhysicsMagnetic Properties of MatterActual

A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 ~s in earth's horizontal magnetic field of 24 T . When a horizontal field of 18 T is produced opposite to the earth's field by placing a current carrying wire, the new time period of magnet will be

Options

  1. A1 ~s
  2. B2 ~s
  3. C3 ~s
  4. D4 ~s

Correct answer

D. 4 ~s

Step-by-step solution

The time period T of oscillation of a magnet is given by (T=2 I M B ) where, I = Moment of inertia of the magnet about the axis of rotation (M= ) Magnetic moment of the magnet (B= ) Uniform magnetic field As I, B remains the same ( T 1 B ) or ( T₂ T₁ = B₁ B₂ ) According to given problem, ( aligned B₁ & =24 T B₂ & =24 T -18 T =6 T T₁ & =2 ~s T₂ & =(2 ~s ) (24 T ) (6 T ) =4 ~s aligned )

Practice Magnetic Properties of Matter on Quantrex Academy →

More from Magnetic Properties of Matter

A magnetizing field of 360 A/m produces a magnetic flux density B = 0.6 T in a ferromagnetic material. The permeability of the material in T-m/A is 2026There are four lightweight rod samples P, Q, R and S separately suspended by thread. A bar magnet is slowly brought near to each sample and the following observations are noted (a) 2026A paramagnetic sample shows a net magnetization of 8 A/m when placed in an external magnetic field of 0.6 T at a temperature of 4 K. When the same sample is placed in an external m 2026A magnetizing field of 10^3 A/m produces a magnetic flux density 4 T in an iron rod. The relative permeability of the rod will be (permeability of free space ₀ = 4 10⁻⁷ SI units) 2026In an experiment, the interior of a first current-carrying toroid with 1000 turns per unit length is filled with aluminum (susceptibility 2.4 10⁻⁵ ). A second, identical toroid wit 2026Magnetic susceptibility ( ) is related to magnetic relative permeability ( _r ) by the relation 2026A magnetic material has a relative permeability ( _r) of 6001 . If it is placed in a magnetizing field (magnetic intensity) of H = 2000 A/m , The total magnetic induction (B) insid 2026Which of the following statements is INCORRECT for diamagnetic materials? a. Relative permeability is less than one. b. Magnetic susceptibility is negative and low. c. Magnetic sus 2026 Full Magnetic Properties of Matter list All NEET PYQs